Improvement in lifting-jacks



'N. WARREN.

Lifting-Jacks.

NOJBO 498, PatentedMay 5.1874.

WITNESSES. l |NVENTUR W ,dwai

NELSON WARREN, OF 'WILMINGTON, DELAWARE;

IMPROVEMENT IN LIFTlNG-JACKS.

Specification forming part of Letters Patent No.15lA98, dated May 5,1874; application filed March 7, 1874.

To all whom it may concern:

Be it known that I, NELsoN WARREN, of Wilmington, in the county of NewCastle and State of Delaware, have invented certain new and usefulImprovements in Lifting-Jack; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it pertains to make and useit, reference being had to the accompanying drawings, which form part ofthis specification.

The nature of my invention relates to an improvement in lifting-jacks;and it consists in the peculiar arrangement and combination of devices,which will be more fully described hereafter, whereby a cheap, portable,and powerful jack is produced, and one which is not liable to be brokenor get out of repair.

Figure 1 represents a side elevation of my ilwention. Fig. 2 is an edgeview of the top part of the casting and frame.

a represents a triangular frame, made of two pieces of board securedtogether at their upper ends, and braced by a metallic cross-bar, I).This frame, having no base-plate, is peculiarly adapted to all kinds ofsurfaces, and can be used with case where others cannot be made to standerect. The casting c, which forms a frame in which the operating lever dis pivoted, and through which the lifting-bar 0 works up and down, has asooket,' formed on one side, so as to fit over the top of the frame alike a cap, and thus support the casting in position. The lifting-bar,of ordinary construction, has a projection, h, formed upon one side atthe top, which serves as a handle by which the bar is lifted upwarduntil its head, made slightly concave on top, strikes against the underside of the object to be raised, when the lever d is pressed downward.Upon the ing by a socket, and thus prevents any of the parts from beingbroken. J ournaled in the frame or castin 'ust back of the bar is afriction-roller, Z, against which the bar presses in its movements upand down, so as to make it move as easily as possible.

The operatinglever has but afew cogs formed upon the end which engageswith the cogs of the bar, so that when raised upward at an angle ofabout sixty degrees their cogs will no longer engage, when the bar canbe freely raised upward, or will fall from its own weight. After thelever has been depressed, raisin g the bar and its load upward, apivoted latch or catch, 0, is turned over a small stud or projection, n,formed on the side of the lever, when the lever will be held in theposition shown in. Fig. 1.

Having thus described -m y invention, I claim 1. The combination of thespring j and lifting-bar having the flange 6, substantially as setforth.

2. The lifting-bar provided with the lug 71, substantially as shown.

3. The combination of the frame a and cast- NELSON \VARREN.

Witnesses F. A. LEHMANN,

OLIVER P. WELoH.

